Peters



(No Model.)

0. KARTZMARK.

HOLDER 0R SOCKET FOR ELEGTRIGLAMP GLOBES.

No. 244,255. Patented July 12,1881.

dig/M84) "11%,. M MAW/K UNITED STATES PATENT OFFICE.

OTTO KARTZMARK, OF NEW YORK, N Y., ASSIGNOR TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF SAME PLACE.

HOLDER OR SOCKET FOR ELECTRIC-LAMP GLOBES.

SPECIFICATION forming part of Letters Patent No: 244,255, dated July 12, 1881. Application filed March 22, 1881. (No model.)

To all whom it may concern:

Be it known that I, Orro KARTZMARK, of the city, county, and State of New York, have invented certain new and useful Improvements in Holders or Sockets for Electric-Lamp Globes, of which the following is a specification.

My invention relates to the socket or supporting-base for an incandescent lamp; and it consists in an improved arrangement of the retaining-springs attached to and forming a part thereof, whereby it is capable of retaining firmly lamps of different shapes and sizes, as will be hereinafter more fully set forth and claimed.

- The sockets over which this present invention is an improvement are composed of a cylindrical base of insulating material, on the opposite sides of which are attached metal plates, each having two or more spring projecting points or fingers which hold in place the neck of the ordinary lamp-globe. As now constructed these springs bear on the neck some distance above its end, so thatirregularshaped lamps have a tendency to tipand wabblc in their sockets.

It is very difficult to form the necks of a number of lamp-globes which are blown from glass of the same shape and size so that they will all exactly fit into the spring-sockets now in use and be retained thereby in an upright position. To remedy this, and to adapt the springsocket to the variously shaped necks, I attach to the ordinary springs now employed other supplementary springs in such a way as to form a socket having an inereasednumber of bending-points, and one which will conform to the shape of the neck.

In the drawings hereto annexed, Figure 1 represents a lamp and base combined. Fig. 2 is a plan view of the base, showing the disposition of the springs; Fig. 3, a perspective of one of the retaining-plates with its auxiliary spring attached; and Fig. 4: is a view, partly in section, of the same.

A is a cylindrical base of insulating material containing the circuit making and breaking mechanism. To the opposite sides of this are attached the plates of resilient metal B B, each plate being provided with a set of projecting points or fingers, O G, which, by being bent inward, bind against the neck of a globe, A, atfour points on a circumferential line. The purpose of these plates and springs is both to retain the globe in its socket and to serve as terminals for the line-wires, and the conductors of the lamp are brought out around the neck so that the lamp, when in place, will bring the same into contact with the said plates or springs.

To the upper ends of the fingers O O are attached additional springs D, cut out of sheet metal in nearly the same shape as plates B, but with a narrower connecting-strip, D, and shorter side pieces, D D. These latter, being secured at a small angle to the plates B, as shown in Fig. 3, will bind the end of theglobeneck when the same is inserted in the socket, and from the manner in which they are attached thereto it is obvious that as the ends of O O are forced out the part D will have a tendency to bind the lamp-neck tighter, and vice versa.

Instead of being constructed as shown, the two springs B and D may be cut in one piece, from sheet metal, and bent into the required form.

The socket thus constructed is cheaply and easily made, and as the connections may be made from the springs D to the conductors of the lamp, as shown in Fig. 1, good electrical contact is always insured, even though the neck, or that part of globe by which it is retained, be irregular in shape.

The shape of the springs being in great measure immaterial, it is evident that their construction may be considerably-varied without departing from the general idea involved in the form described in the foregoing.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

The combination, in a spring-socket for incandescent lamps, of the insulating-base A, oppositely-disposed sets of bearing-springs O O, forming the terminals of an electric circuit, and supplementary binding-springs D D, extending downward and at an angle from the upper ends of the said springs (l (J, the lower ends of the binding-springs of each set being connected by metal contact-strips, as and for the purposes set forth.

In testimony whereof I have hereunto affixed my signature in the presence of two subscrib- Witnesses: OTTO 'KARTZMARK.

HENRY HINE, J 0s. E. LocKwoon.

.ing witnesses. 

